/**
 *    Copyright 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/db/repl/handshake_args.h"

#include "mongo/base/status.h"
#include "mongo/bson/util/bson_check.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/jsobj.h"

namespace mongo {
namespace repl {

namespace {

    const std::string kRIDFieldName = "handshake";
    // TODO(danneberg) remove after 2.8 since this field is only allowed for backwards compatibility
    const std::string kOldMemberConfigFieldName = "config";
    const std::string kMemberIdFieldName = "member";

    const std::string kLegalHandshakeFieldNames[] = {
        kRIDFieldName,
        kOldMemberConfigFieldName,
        kMemberIdFieldName
    };

} // namespace

    HandshakeArgs::HandshakeArgs() :
        _hasRid(false),
        _hasMemberId(false),
        _rid(OID()),
        _memberId(-1) {}

    Status HandshakeArgs::initialize(const BSONObj& argsObj) {
        Status status = bsonCheckOnlyHasFields("HandshakeArgs",
                                               argsObj,
                                               kLegalHandshakeFieldNames);
        if (!status.isOK())
            return status;

        BSONElement oid;
        status = bsonExtractTypedField(argsObj, kRIDFieldName, jstOID, &oid);
        if (!status.isOK())
            return status;
        _rid = oid.OID();
        _hasRid = true;
        
        status = bsonExtractIntegerField(argsObj, kMemberIdFieldName, &_memberId);
        if (!status.isOK()) {
            // field not necessary for master slave, do not return NoSuchKey Error
            if (status != ErrorCodes::NoSuchKey) {
                return status;
            }
            _memberId = -1;
        }
        else {
            _hasMemberId = true;
        }

        return Status::OK();
    }

    bool HandshakeArgs::isInitialized() const {
        return _hasRid;
    }

    void HandshakeArgs::setRid(const OID& newVal) {
        _rid = newVal;
        _hasRid = true;
    }

    void HandshakeArgs::setMemberId(long long newVal) {
        _memberId = newVal;
        _hasMemberId = true;
    }

    BSONObj HandshakeArgs::toBSON() const {
        invariant(isInitialized());
        BSONObjBuilder builder;
        builder.append(kRIDFieldName, _rid);
        builder.append(kMemberIdFieldName, _memberId);
        return builder.obj();
    }

}  // namespace repl
}  // namespace mongo
